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标题：SOLAR NANOPHOTOCATALYTIC DECOLORISATION OF REACTIVE DYES USING TITANIUM DIOXIDE
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作者：JENI J. ; KANMANI S.
期刊名称：IRANIAN JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE AND ENGINEERING (IJEHSE)
印刷版ISSN：1735-1979
出版年度：2011
卷号：8
期号：1
页码：15-24
语种：English
出版社：IRANIAN ASSOCIATION OF ENVIRONMENT HEALTH, TEHRAN, UNIVERSITY OF MEDICAL SCIENCES
摘要：The discharge of dye-bearing wastewater from textile industries into natural streams and rivers poses severalproblems. Some dyes are toxic to aquatic life, may damage aesthetic nature of the environment and are difficult to be treated by conventional methods. The present work investigated the photodecolorization of reactive dyes by solar nanophotocatalysis. Nano-TiO₂ was prepared using a sol-gel method and their surface state was analyzed by X-ray diffractometer. Procion Reactive Red (H-E7B) and Procion Reactive Yellow (H-E6G) were used as model compounds. The effects of operational variables such as catalyst type and dose, pH, contact time, H₂O₂, anions (C1^-, SO₄^2- and CO₃^2-), solar light intensity and catalyst reuse were investigated. The complete color removal was achieved at optimum conditions of catalyst dose of 160mg/L, pH=5.5 and contact time=95 min for dye sample H-E7B and catalyst dose of 500 mg/L, pH=7.4 and contact time=150 min for dye sample H-E6G, respectively. At optimum conditions, COD reduced from 120 mg/L to 23 mg/L and from 108 mg/L to 17 mg/L for the two types of dye, respectively. Kinetic analyses indicated that photocatalytic decolorization rate a followed a first-order model.
关键词：REACTIVE DYES; SOLAR NANOPHOTOCATALYSIS; CATALYST REUSE; SOL-GEL; DECOLORIZATION